[SIPForum-discussion] inbound & outbound proxy

[Nilima Verma]

Pretend you are a SIP User Agent, perhaps a very simple UA that doesn't

even do DNS lookups.



A call coming to you is "inbound".



It may hit your home proxy first, and receive treatment such as being

proxied to you based on your registered contact. This is an "inbound

service", and your home proxy is acting as an "inbound proxy".



Now you want to make a call. Since you're making the call, it is going

"out", or can be called "outbound". You send this call to a proxy, which

looks up the request URI in DNS and sends the call on towards its

destination. This proxy is providing the "outbound service" of DNS

resolution, and is acting as an "outbound proxy" for this call.



On any call there may be any number of inbound and outbound proxies and

services. Some proxies may even provide both sorts for a single call.
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